Pick for mining-machines



(No Model.)

G. D. WHITOOMB.

PICK FOR MINING MAGH INES.

No. 280,543. Patented July 3, 1883.

w C m 0/ 7 0 W a J 7 1 9 m P QM UNITED STATES PATENT OFFICE.

GEORGE D. WHITOOMB, OF CHICAGO, ILLINOIS.

.PICK FOR MINING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 280,543, dated July 3, 1883.

Application filed January 25, 1883.

To all who/wit Ill/0,] concern.-

Be it known that I, GEORGE D. \VnrrooMB, a citizen of the United States, residing in Ohicago, in the county of Cook, in the State of Illinois, have invented a certain new and useful Improvement in Picks for Coal-Mining Machines, which is fully set forth in the following specification, reference being had to the accompanying drawings, in which Figure 1 is a perspective view of my improved pick. Fig.2 is a detailed section of the cutting end of the pick, taken on the line a; a: in Fig. 1. v

The same letters denote the same'parts in bothfigure. I

My invention relates to picks for coal-mining machines.

In my Patent No. 232,7 92, dated September 28, 1880, I have described and shown a pick well adapted for use in ordinary coal and for ordinary purposes. It is sometimes impor tant, however, to cut in the walls of a chamber a vertical channel straight on both sides. The pick shown in the patent must be turned repeatedly from side to side in order'to out such a channel. To avoid this inconvenience I have devised a pick for this particular work. (Shown in the drawings.) This pick, in its fundamental idea, consists of two of the picks described in the patent above named, joined together, their fiat sides being outward, as shown in Fig. 1 of the drawings, in which A, in each side, will be seen to substantially represent a chisel-pick, with a notch, a, in the cutting-edge, as in Patent No. 232,792. These (No model.)

two side cutting edges are joined at their notches by a transverse web, a, which also represents a re-entrant edge, and is beveled to form a cutting-edge, and extends across from side to side. This web slopes back on each side from its cutting-edge gradually, forming grooves or channels, through which the debris escapes, thereby preventing the pick from becoming clogged. Obviously, with this pick a wide channel can be cut on each side of the pick without turning the latter. In case the face of the coal is diversified by the presence of projections and pockets, which occur in some soft kinds of coal, this pick is also useful, for, as it has a wider cutting-field, there is less danger of glancing than is the case with the single chisel-pick when it strikes on one side of a projection.

WVhat I claim as my invention, and desire to secure by Letters Patent, is-

1. A pick for coal-mining machines, provided with a pair of parallel notched chisel-edges and a chise1-edged web extending from one side to the other, joining the two former midway, 

